Grease interceptor



Nov. 14, 1944. E w N, BQQSEY4 v2,362,447 GREASE INTERCEPTOR OriginalFiled April 29, 1940 A INVENTOR.

Patented Nov. 14, 1944 UNITED STATE s PATENT oF FICE GREASE INTERCEPTOREdward W. N. Bosey, Detroit, Mich.

' Continuation of application Serial' No. 332,169, April 29, 1940. Thisapplication September .30,

. 1943, Serial No. 504,499

l11 claims. (c1: aro-56)' to .cause the greases to rise to the surfaceof .the

water in the body of the interceptor and means for'withdrawing the oilsand greasesfrom the interceptor separately from .the water.

It is further an object `and feature of the invention to provide aninterceptor including a chambered body into which water containing oilsand greases is to be discharged andv anoutlet associated with which isameans -for discharging the gases accumulating in theibody to theoutlet, said means including a trap and functioning .to preventsiphonage of the vcontents of thev interceptor and a skimmer to whichoils and greases at the surface of theliquid may flow.

An additional object and feature ofthe invention is to provide a greaseinterceptor having an inlet adjacent the bottom on one sideand an outleton the other, which outlet extends to a point f for determiningtheminimum liquid level `in the interceptor and between` the inlet andoutlet a partition like element recessed 'to receive the -inowing waterand grease yand providing a vtime period permitting greases to rise tothe surface of the liquid and Water to discharge ybeneath thepartition-like element to the outlet.

These and other objects and various novel features of the invention arehereinafter more fully described and claimed, and the preferred form ofconstruction of a grease interceptor embodying my invention is shown inthe accompanyingdrawing in which- Fig. 1 is a plan view of my improvedgrease interceptor partly broken away to show internal construction.

Fig. 2 is a vertical section thereof `taken on line 2 2 of Fig. 1.

Fig. 3 is an elevation taken from the outletside of the interceptor andpartlybroken away to show the skimmer.

Fig. 4 is a sectional elevation taken on linev 4 4 of Fig. 2 showing theskimmer in elevation.

In its preferred form, my limproved *interceptor consists of a chamberedbody I having an. inturned ange 2 at the top -to receivea cover v3 whichmay be sealed to prevent an escape of gases Afrom the container as by asealing material in the space 4 between the edge of the vcover and the:walls of the` body at the ;top. :On oneside and adjacent thevbottom ofthe body is -an inlet ,5 land on the ,oppOSiteside is anv outletIconduit 6 preferably lextending Iupwardly exteriorly of the body andvformed with an youtturned Aend portion Tand determining the minimumliquid level at about the vdotted line 8, A partition 9 extendstransversely of the body at a right angle tothe axis of the inlet 'andthis partition .engages opposite sidewalls of the body -and is formedwith a depending bottom .edge vpor-tion Ill spaced from the bottomv,wall I-I ofthe body which bot-tom wall isy preferably `inclineddownwardly to the outlet.

Above this terminal bottom edgeportion ID, the partition is -formed withabend providingy a recess 12.

Iheibottom Wall I3 of vtherecess is downwardly inclined. in respect ytothe horizontal and tho upper portion 4Ill is upwardly inclined inrespect tothe vertical and the partition extends v,verti- Gally.upwardlrirom Vtho upper ond of the portion I4. l

Theplane of said Verticalportionis materially inwardly of the-planeoccupied by the bottom edge portion .I0 of -tlie partition. The bottomportion l0 slspaced from the wall ofthe body adjacent the inletprovidingya narrow kc lriannel l5.

Fluidcontaining water, oils and greases discharging into the bodythrough `tho .inlet flows at a -suiiiciently rapid rate to be projected.into the-recessglz and to ,be theredeflected upwardly by the 4 shapeofthe walls formingthe recess-.thus providing ,opportunity zand timeperiod for ,th greases and oils to rise `tothe surface of the Waterbetween the lpartition-9 and the wall on the inletsidepftheinterceptor,andfor water to pass out,- wardly through thechannel I 5 and along ,the bot,- tom-.I I rto theoutlet. I n the passageof the-Water from beneath the .Wall i0 `of .the partition ,to theoutlet,still.further opportunity for Vriseof greases isuprovlded.

In Athe discharge of liquid containing oils `and greases ,into theinterceptor, la rise in levelof `the liquid in Ythe interceptor iscaused and the Lupper edgeyofithe'vpartition member. 9v is -formed .witha comparatively narrow-'slot I 6, the lbottom edgeof which is slightlyabove -theglevel of ftheliqlld.

With 1the `water and oils discharging into the interceptorfon the inletside of the partition, a comparatively rapid rise in the leveliof theliquid in gthecha-mber .-I;'I `between the partition `and `theinletsideofthe interceptoris caused and theoils thereinwill begin toDass'through-the slot I'6 to the mainfchamber :I8 of the interceptorand, dependingupon fthe quantityof liquid discharging, thelevel of ltheliquid inthe chamber `II between carrying the greases and oils with thewater beneath the lower edge I of the partition and thence to theoutlet.

In a grease interceptor, there are always some gases forming in the bodyand air discharged into the body above the liquid level which ordi-ynarily would produce pressure in the chamber and, to prevent anaccumulation of gases in the upper part of the body, I provide a trap,one leg I9 of which extends preferably interiorly of the body and isopen at the top above the level 'of the cover which is formed with arecess therefor and gases may pass into this leg of the trap. lThe otherleg 2| of the trap extends to *the exterior of the interceptor and isopen to the outlet ceptor substantially as shown. The wall 22 tends toconfine the flow to the outlet in a stratum along the bottom I I of thebody and liquid tending to flow to the outlet from above the wall 22 isdeflected inwardly of the body and thus there is a tendency to agitatethe liquid within the chamber I8 particularly adjacent the lower partthereof tending to permit any oils or greases still contained therein topass upwardly in the body.

The oils and greases accumulate on the surface of the liquid in the bodyand` means is provided to draw off the oil. For this purpose, I providewhat I have termed a skimmer 23 which has va shape in elevation asindicated in Fig. 3 and the skimmer has an upper edge 24 extendinghorizontally from side to side of the body just below the normal liquidlevel in the body. The skimmer is thus of shallow depth in its midsection indicated at 35 and increases in depth each side of the centralportion to form the similar chambers 25 and 26. Thus the oils andgreases will flow over into the skimmer or container which is formed atthe greatest depth on each 'of the opposite sides of the deviceproviding similar chambers 25 and 26. The wall of the receptencle on theoutlet side is formed with a plugged opening 21 on one side and a draw01T cock 28 is provided on the opposite side which may be of anyapproved form. The plugged opening 2I and the draw off cock 28 open tothe respective chambers 25 and 26 to enable the liquid to be withdrawnfrom the skimmer. The plugged opening on the one side will permit accessto the interior of the skimmer for removal of grease and the draw offcock may also be removed for the same purpose.

By the described arrangement of parts, a comparatively inexpensivestructure is provided and may be cast 'in one piece if desired and as isshown. The partition member 9, however, may be removably mounted inposition by provision of a lug 29 on the opposite side walls indicatedby dotted lines in Fig. 2 and a pair of lugs 30 and 3l adjacent the topwhich would support a removable wall in the desired position.

It is further pointed out that it is not necessary to provide apartition extending the full width of the body as a lesser width ofplate provided with a recess for the function described may be used.

The construction of a trap at the point of connection with the outlet issuch as tox provide an opening having a removable plug 32 in alignmentwith the vertical portion of the outlet which permits access thereto andto the trap for the cleaning of the same.

It is also further desirable in some installations and sometimesrequired to provide a vent to atmosphere to 'prevent accumulation ofgases in the body. For this purpose, I provide a wall of the bodyforming part of the conduit I9 of sunlcient thickness to permit the sameto be tapped to receive a vent pipe 33 as shown in Fig. 2. With such avent to atmosphere, gases in the upper part of the body may pass to theinlet 20 of the trapped vent I9v and thence to atmosphere through thepipe 33.

From the foregoing description, it is believed evident that the variousfeatures and objects of the invention are attained by the constructiondescribed which includes inexpensiveness of construction and arelationship of parts providing for an e'icient separation of the oilsand greases from the water and the removal of gases from the body of thecontainer as well as prevention of siphonage and it is pointed out thatvarious Vchangesin the construction of the device may be made withoutdeparting from the spirit and scope of the invention as set forth in theappended claims.

Having thus briefly described my invention, its utility and mode ofoperation, what I claim and desire to secure by. Letters Patent of theUnited States is:

1. In a grease interceptor, a chambered body having an inlet on one sidenear the bottom and an outlet on the opposite side opening to the bodynear the bottom and arranged to determine the minimum liquid leveltherein, 'a partition adjacent the inletr having a recess in its faceopposite the inlet, the bottom wall of the recess beingpracticallyaligned with the lower side of the inlet,

and a bottom edge extending to close spaced re.

lation with and below the inlet and spaced from the bottom of the body,said recessed portion receiving the liquiddischarging into the body andshaped to deflect the same upwardly between the partition and the wallon the inlet side of the -body'lby force of inflow whereby the lighteroils and greases may have opportunity to rise to the lsurface-and theliquid andV water thus freed of matter having less specic gravity maypass beneath the partition to the outlet. l, v

2. In a grease interceptor, a chamberedv body having a bottom wall andan inlet on one side near the bottom wall and an outlet on the .oppositeside at the bottom, said bottom wall being downwardly inclined from theinlet toward the outlet, a partition member within the body having thebottom edge thereof adjacent the inlet and spaced from the inlet walland bottom wall ofthe body, an upper vertical portion spaced a greaterdistance from the inlet wall than Athe said lower edge, a curved portionproviding a recess opposite the inlet and connecting the'said upper andlower portions of the partition where; by liquid flowing into the bodythrough the inlet enters the'said recess and is deflected upwardlybefore passing beneath the partition thereby prof viding Aa Vtimeinterval permitting oils, greases,

etc., to pass to the top of the liquid in the body, saidoutlet being ofa construction determining the minimum water .level and the upper edgeof the partition member having a slot above the normal liquid level andthrough 'which the greasesl may pass on the .raising of the liquid levelby inflowing liquid, said body having a cover in sealedrelationtherewith preventing an escape of .gases from the top of the body, and atrap having a leg opening to the body above the liquid level, and a legopening to the outlet belowthe normal liquid level.

f "3. In.a grease interceptor, a chambered body having a bottom wall, aninlet `on one side ofthe l bodynear the bottom wall thereof and anoutlet I on the opposite side at the bottom, said bottom Awall beingdownwardly inclined from the inlet toward'the outlet, a partitionmember' within the body having the bottom edge thereof `adjacent theIinlet and spaced from the inlet walland bottom wall of the body, anupper vertical portion spaced a greater distance from the inlet wallthan the said lower edge, a curved portion providing a recess oppositethe inlet and connecting the said upper and lower portions of thepartition whereby liquid owing into the body through theinlet enters thesaid recess and is deflected upwardly before passing beneath thepartition upper. edge spaced fromthe cover and a portion of its faceopposite/to the inlet and a bottom por# tion located below the inlet andspaced from the inlet lwall and from the .chamber bottom, that theheavier water beneath the partition toward the outlet y 6.v In a greaseinterceptor, a chambered-body thereby providing a time intervalpermitting oils,

greases etc., to pass to the top of the liquid in the body, said outletbeing of a construction determining the minimum Water level and theupper edge of the partition member having a slot above the normal liquidlevel andvthrough which the greases may pass on the raising'of theliquid level by iniiowing liquid, said body having a cover in sealedrelation therewith preventing an escape of .gases from the top of thebody, a trap having a leg opening to the body above the liquid level,and a leg opening to the outlet below the normal liquid level, and meansfor withdrawing greases and oils from the surface of the liquid.

4. In a grease interceptor, a chambered body having an inlet onone sideadjacent the bottom and an outlet on the opposite side adjacent, thebottom, a member mounted within the body adjacent the inlet and spacedfrom 'the bottom thereof, said member having a recess in its faceopposite the inlet into which the liquid discharges from the inlet, saidrecess having an upwardly extending wall inclinedvto the vertical towardthe inlet wall providing a means for defiecting the inflowing liquidupwardly and toward the inlet wall before it passes between the memberand the said inlet wall to the outlet thereby providing a time intervalfor material of less specific v gravity than water to rise to thesurface of the liquid in the body, said outlet being constructed tomaintain a minimum level of liquid in the body, a skimmer formedintegrally with the outlet member and providing a horizontal edgeportion extending transversely of the body and positioned below theliquid level Within the body, said skimmer having a chamber on each sideof the body for receiving grease passing over the skimmer edge, andmeans associated with each chamber through which greases may bewithdrawn therefrom.

5. In a grease interceptor,a'chambered' body having a cover and furtherhaving an inlet thereto through one wall and an outlet, therefrom, apartition in the chamber of said body having its having lan inletvthereto through one wall and any outlet therefrom, a partition in thechamber. of `said rbody having a portion of its faceopposite to theinlet and a bottom portion located below the inlet and spaced from theinlet wall .and from the chamber bottom, that portion ofthe partitionwhich is opposite the inlet being adapted to receive the impact ofliquid discharged into the Chamber and being shaped to deiiectthe liquidon the inlet side of the partition and thereby l.promote yand assist inrise of the lighter oils and grease and downward Vflow of the heavierywater beneath the partition toward the outlet, theupper portion of saidpartition being spaced further` than its bottom portion from theinletWall and being provided with a narrow vertically extending slot whoselower end liesabove the minimum liquid level in said chamber andthroughy which oil and grease pass when the liquid level rises on theinlet side of the partition.

7. In a greaseinterceptor, a chambered body having an inlet and anoutlet and a' cover, a partition adjacent the inlet the upper edge ofwhich is spaced from the cover and having a deflecting vportion -of Vitsface opposite lthe inlet and a bottom portion extending .to close spacedrelation with and below the inlet and spaced from the bottom of thebody, said partition extending upwardly to above the liquid level andbeing provided with a vertical slot open through the upper edge thereof,v'said deecting portion receiving liquid discharged into the body andhaving a form to deeet liquid upwardly substantially as described todeflect the same upwardly between the partition and the wall on theinlet side of the body by force of inflow, whereby the lighter oils andgreases may have opportunity to rise to the surface and the liquid andwater thus freed of matter having less specic gravity may pass beneaththe partition to the outlet. i Y y 8. In a grease interceptor, achambered body having an inlet and an outlet, a partitionmember withinthe body having a bottom portion adjacent the inlet and spaced from theinlet wall and from the bottom wall of the body and an upper portionspaced a greater distance from the inlet wall than the said bottomportion and a curved portion providing oil 'deiiecting means' lyingopposite the inlet and connecting the said upper and lower portions ofthe partition, whereby liquid flowing into the body through the inletengages the oil deflecting means and is deflected upwardly beforepassing beneath the partition,

thereby providing a time interval permitting oils, greases and so forth,to pass to the top of the liquid in the body, the upperv edge of thepartition member having a slot above the normall liquid level andthrough which the greases may pass on rise of the liquid level byinflowing liquid,

said body having a cover in sealed relation therewith preventing escapeof gases from the top of the body chamber, and liquid sealing meansopening both to the body chamber and to the outlet.

9. In a grease interceptor, a chambered body having an inlet and anoutlet, a partition member within the body having a bottom portionadjacent the inlet and spaced from the inlet wall and from the bottomwall of the body and an upper portion spaced a greater distance from theinlet wall than the said bottom portionand a curved portion providingoil deiiecting means lying opposite the inlet and connecting the saidupper and lower portions of the partition, whereby liquid flowing intothe body through the inlet engages the oil deecting means and isdeflected upwardly before passing beneath the partition, therebyproviding a time interval permitting oils, greases and so forth, to passto the top of the liquid in the body, the upper edge of the partitionmember having a slot above the normal liquid level and through which thegreases may pass on rise of the liquid level by inflowing liquid, saidbody having a cover in sealed relation therewith preventing escape ofgases from the top of the body chamber, liquid sealing means openingboth to the body chamber andvto the outlet, and beans for withdrawinggreases and oils from the surface of the liquid. V

l0. vIn a grease interceptor, a chambered body having an inlet on oneside thereof adjacent the bottom and an outlet manifold exteriorly ofthe body on another side thereof and adapted at its upper end forconnection with an outlet conduit and at its lower end opening to thebottom of the chambered body, said outlet manifold determining thenormal liquid-level in the body, means f or venting the gas and airspace in the body to the outlet manifold comprising a U shaped traphaving one leg interiorly of the body and open at its top to the air andgas space of the body and the other leg exteriorly of the body andconnected to the outlet manifold and opening thereto below the normalliquid level in the body, and an oil skimmer mounted on the said ventmeans within the body and having a closable opening for removal ofgreases and oils from the surface of liquid in the interceptor body tothe exterior thereof, the whole providing a structure wherebyaccumulation of gases above the liquid level -in the body under certainpressure forces the liquid from the trapA thereby permitting the gasesaccumulated in the body above the liquid level to pass to the outletmanifold and thence to the outlet conduit.

11. In a grease interceptor, a chambered body having an inlet on oneside thereof adjacent the bottom and an outlet manifold exteriorly ofthe body on another side thereof and adapted at its upper end forconnection with an outlet conduit and at its lower end opening to thebottom of the chambered body, said outlet manifold determining thenormal liquid level in the body, means for venting the gas and air spacein the body to the outlet manifold compriisng a U shaped trap having oneleg interiorly of the body and open at its top to the air and gas spaceof the body and the other leg exterorly of the body and connected to theoutlet manifold and opening thereto below the normal liquid level in thebody, and an oil skimmer mounted on the said vent means within the bodyand having a closable opening for removal of greases and oils from thesurface of liquid in the interceptor body to the exterior thereof, thewhole providing a structure whereby accumulation of gases above theliquid level in the body under certain pressure forces the liquid fromthe trap thereby permitting the gases accumulated in the body above theliquid level to pass tothe outlet manifold and thence to the outletconduit.

EDWARD W. N. BOOSEY.`

